气候变化领域集成服务门户(CCPortal): Designing efficient spin Seebeck-based thermoelectric devices via simultaneous optimization of bulk and interface properties

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DOI	10.1039/d1ee00667c
	Designing efficient spin Seebeck-based thermoelectric devices via simultaneous optimization of bulk and interface properties
	Kim M.Y.; Park S.J.; Kim G.-Y.; Choi S.-Y.; Jin H.
发表日期	2021
ISSN	17545692
起始页码	3480
结束页码	3491
卷号	14 期号:6
英文摘要	The spin Seebeck effect (SSE) refers to a direct energy conversion of heat to electricity that exploits magnon current in a ferromagnet (FM)/normal metal (NM) heterostructure. Since SSE is a transverse thermoelectric effect, it can be employed to realize transverse thermoelectric devices, which could potentially overcome the inherent limitations of conventional Seebeck effect-based devices. Yet, the widespread use of SSE is currently hindered by its low conversion efficiency. The thermoelectric efficiency of SSE can be improved through an optimization of bulk FM as well as FM/NM interface. A bulk FM can enhance the thermoelectric efficiency by introducing a ‘phonon-glass magnon-crystal’ concept, wherein scattering centers selectively scatter the heat-carrying phonons while not affecting the magnons that contribute to SSE. A high-quality FM/NM interface can boost the spin pumping across the interface as well as the electrical transport in NM. Here, by adopting polycrystalline nickel-ferrite (NFO)/Pt as a platform, we demonstrate the successful optimization of bulk FM together with FM/NM interfaceviaa simple heat treatment scheme. The phase separation of NFOviasuch heat treatment results in a distinctive hierarchical microstructure of nano-sized NFO embedded in micro-sized NiO precipitates; this structure selectively scatters phonons while barely affecting magnons, leading to reduced thermal conductivity without variation of spin Seebeck coefficient. The simultaneous formation of a clean and smooth NFO/Pt interface provides efficient spin pumping at the interface and high electrical conductivity of Pt. As a result, the energy conversion efficiency of SSE in NFO/Pt system can be significantly improved. The proposed facile approach can be applied to design highly efficient oxide-based SSE devices. © The Royal Society of Chemistry 2021.
英文关键词	Frequency modulation; Heat treatment; Nickel oxide; Phase separation; Phonons; Seebeck effect; Thermal conductivity; Thermoelectric energy conversion; Hierarchical microstructures; High electrical conductivity; Polycrystalline nickel ferrite; Simultaneous optimization; Spin Seebeck coefficients; Thermoelectric devices; Thermoelectric efficiency; Transverse thermoelectric effects; Conversion efficiency; architectural design; electrical conductivity; energy efficiency; microstructure; nanoparticle; optimization; precipitation (chemistry); pumping; thermal conductivity
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/190636
作者单位	Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea; Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea; Materials Imaging and Analysis Center, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea
推荐引用方式 GB/T 7714	Kim M.Y.,Park S.J.,Kim G.-Y.,et al. Designing efficient spin Seebeck-based thermoelectric devices via simultaneous optimization of bulk and interface properties[J],2021,14(6).
APA	Kim M.Y.,Park S.J.,Kim G.-Y.,Choi S.-Y.,&Jin H..(2021).Designing efficient spin Seebeck-based thermoelectric devices via simultaneous optimization of bulk and interface properties.Energy & Environmental Science,14(6).
MLA	Kim M.Y.,et al."Designing efficient spin Seebeck-based thermoelectric devices via simultaneous optimization of bulk and interface properties".Energy & Environmental Science 14.6(2021).